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Re: subscripting arrays [message #46250 is a reply to message #12707]

Mon, 14 November 2005 01:53

wem
Messages: 6
Registered: October 2005

Junior Member

David Fanning wrote:
> Benjamin Hornberger writes:
>
>
>
>> this is probably simple, but I can't figure it out right now:
>>
>> I want to extract an element from a 2d array, and I have the 2d
>> subscripts of that element available as a 2-element vector.
>>
>> IDL> a = dist(300)
>> IDL> b = [30, 50]
>> IDL> print, a[b]
>> 30.0000 50.0000
>>
>> Not what I want. What I want is
>>
>> IDL> print, a[b[0], b[1]]
>> 58.3095
>>
>> Is there a more elegant way than splitting b up?
>
>
> If by "elegant" you mean "correct", then the answer is no. :-)
>
> Cheers,
>
> David
>

And if you mean by "elegant", "more readable", then the answer is: yes ;-)

IDL> a = dist(300)
IDL> b = [30, 50]
IDL> x = b[0]
IDL> y = b[1]
IDL> print, a[x, y]

and using comments ;-)

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[Message index]

		subscripting arrays with dim > 1 By: fireman on Fri, 28 August 1998 00:00
		Re: subscripting arrays By: wem on Mon, 14 November 2005 01:53
		Re: subscripting arrays By: David Fanning on Sun, 13 November 2005 21:07

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